package com.tanhua.server.interceptor;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.tanhua.server.utils.Cache;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.MethodParameter;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import java.util.concurrent.TimeUnit;


@ControllerAdvice
public class MyResponseBodyAdvice implements ResponseBodyAdvice {
    @Value("${tanhua.cache.enable}")
    private Boolean enable;

    @Autowired
    private RedisTemplate<String,String> redisTemplate;

    private static final ObjectMapper MAPPER = new ObjectMapper();
    @Override
    public boolean supports(MethodParameter methodParameter, Class aClass) {


        return enable && methodParameter.hasMethodAnnotation(GetMapping.class)
                && methodParameter.hasMethodAnnotation(Cache.class);
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter methodParameter, MediaType mediaType, Class aClass, ServerHttpRequest request, ServerHttpResponse response) {
       if (null == body){
           return null;
       }
       try {
           String redisValue =null ;
           if (body instanceof String){
               redisValue= (String) body;
           }else {
               redisValue = MAPPER.writeValueAsString(body);
           }

           String redisKey = RedisCacheInterceptor.createRedisKey(((ServletServerHttpRequest)request).getServletRequest());
           Cache cache  = methodParameter.getMethodAnnotation(Cache.class);
           //缓存的事件单位是秒
           this.redisTemplate.opsForValue().set(redisKey,redisValue,Long.valueOf(cache.time()), TimeUnit.SECONDS);
       }catch (Exception e){
           e.printStackTrace();
       }

        return body;
    }
}
